OK, based on that last comment I'm tentatively marking this as fixed. If it still happens on 25.04 for someone, I think it might be best to open a new bug and link to this one.
** Changed in: gnome-settings-daemon (Ubuntu) Status: Triaged => Fix Released ** Changed in: mutter (Ubuntu) Status: Triaged => Fix Released -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to mutter in Ubuntu. https://bugs.launchpad.net/bugs/1971434 Title: Display powersave only blanks, but does not turn off Status in GNOME Settings Daemon: New Status in Mutter: New Status in gnome-settings-daemon package in Ubuntu: Fix Released Status in mutter package in Ubuntu: Fix Released Bug description: [ Impact ] On some machines when the screen blanks, the LCD backlight stays on. [ Workarounds (reported to work by some people) ] * Configure the monitor (in its own menus) to not auto-switch inputs. * Change from HDMI to DisplayPort cables. * Disable HDMI audio output. [ Test Plan ] 0. Make sure you're using an LCD (not OLED) so you can see if the backlight is on. 1. In Settings -> Power -> Screen Blank, set the inactivity period to 1 minute. 2. Verify after 1 minute that the screen is blank and the backlight is also visibly off. [ Where problems could occur ] [ Other Info ] To manage notifications about this bug go to: https://bugs.launchpad.net/gnome-settings-daemon/+bug/1971434/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp